Hello, Can someone explain to me how Mojang blocks a server? what do they do on their end to stop someone from connecting to a private server, do they block the IP on their clients? and if so how? I just don't understand how its possible to block things on something as open as Minecraft. How about those offline servers, can they block them as well? because they aren't online/connected to Mojang servers in the first place. Do they just get off the hook?